<!DOCTYPE html>
<html>
	<head>
		<meta charset="UTF-8">
		<title></title>
		<style type="text/css">
			#box{
				overflow: hidden;
				width: 300px;
				margin: 0 auto;
			}
		
			.a{
				width: 100px;
				height: 100px;
				background: red;
			}
			
			.b{
				width: 100px;
				height: 100px;
				background: yellow;
			}
			
			.c{
				width: 100px;
				height: 100px;
				background: blue;
			}
			
			.a,.b,.c{
				float: left;
			}
		</style>
	</head>
	<body>
		<div id="box">
			<div class="a"></div>
			<div class="b"></div>
			<div class="c"></div>
		</div>
	</body>
</html>
